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Microwave and Guided Wave Letters, IEEE

Issue 4 • Date April 1992

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Displaying Results 1 - 7 of 7
  • Wavelet analysis of backscattering data from an open-ended waveguide cavity

    Publication Year: 1992 , Page(s): 140 - 142
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (303 KB)  

    The wavelet analysis technique is applied to analyze the electromagnetic backscattering data from an open-ended waveguide cavity. Compared to the conventional short-time Fourier transform, the wavelet transform results in a better representation of the scattering features in the time-frequency plane, due to its multiresolution property.<> View full abstract»

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  • Power coupling equations for single-mode, single-polarization optical fibers with effects of leaky modes and broad-band light source

    Publication Year: 1992 , Page(s): 133 - 134
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (130 KB)  

    A set of coupled equations for single-mode single-polarization (SMSP) optical fibers applicable to the case with effects of leaky modes and broadband light sources has been derived. The power coupling coefficients are related not only to the birefringence of the SMSP fiber, but also to the leaky mode loss and the spectral linewidth of the light source.<> View full abstract»

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  • A large-signal GaAs MESFET model for nonlinear circuit simulation

    Publication Year: 1992 , Page(s): 135 - 137
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (221 KB)  

    A GaAs MESFET large-signal model suitable for use in time-domain circuit simulation CAD tools such as PSPICE has been developed. The improved model includes accurate analytic representation of the transconductance and conductance dependence upon the operating voltages. The new model gives better fit to GaAs MESFET I-V characteristics over a wider bias voltage range compared with the Curtice quadratic model. It also provides a simpler and more efficient parameter acquisition procedure in comparison to the TriQuint model. The procedure for extracting the model parameters using the bias dependence of the small-signal elements is also described.<> View full abstract»

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  • Coplanar-waveguide aperture-coupled microstrip patch antenna

    Publication Year: 1992 , Page(s): 138 - 139
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (131 KB)  

    The performance characteristics of a coplanar waveguide (CPW) aperture-coupled microstrip patch antenna were investigated experimentally. A grounded CPW with a series gap in the center strip conductor was used to couple microwave power to the antenna through an aperture in the common ground plane. Results indicate good coupling efficiency and confirm the feasibility of this feeding technique.<> View full abstract»

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  • Performance of a four-element Ka-band high-temperature superconducting microstrip antenna

    Publication Year: 1992 , Page(s): 143 - 145
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (192 KB)  

    Superconducting four-element microstrip array antennas operating at 30 GHz have been designed and fabricated on a lanthanum aluminate (LaAlO/sub 3/) substrates. The experimental performance of these thin-film Y-Ba-Cu-O superconducting antennas is compared with that of an identical antenna patterned with evaporated gold. Efficiency measurements of these antennas show an improvement of 2 dB at 70 K and as much as 3.5 dB at 40 K in the superconducting antenna over the gold antenna.<> View full abstract»

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  • RCS reduction of dielectric cylinders using the simulated annealing approach

    Publication Year: 1992 , Page(s): 146 - 148
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (202 KB)  

    A technique is presented for reducing the bistatic scattering of dielectric struts for radomes, modeled herein as infinite dielectric cylinders, that are illuminated by TMz plane waves. The reduction is achieved by loading the cylinders with perfectly conducting narrow strips oriented parallel to the cylinder axis, and the strip configurations are obtained iteratively by using the technique of simulated annealing. The technique is useful for systematically deriving strip configurations that reduce the radar cross section (RCS) simultaneously for different observation angles and/or frequencies.<> View full abstract»

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  • Complementary HBT push-pull amplifier by selective MBE

    Publication Year: 1992 , Page(s): 149 - 150
    Cited by:  Papers (8)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (202 KB)  

    Microwave performance results are presented of the first monolithically integrated GaAs-AlGaAs complementary HBT push-pull amplifier fabricated using selective molecular beam epitaxy and a merged HBT process. The push-pull amplifier integrates four n-p-n transistors with one p-n-p transistor on the same GaAs chip. The amplifier has a sharp DC characteristic curve with no crossover offset, a voltage swing of 6.3 V using a 9-V supply, and a linear voltage gain of 20. The bandwidth is DC to 2.5 GHz, with a saturated output power of 7.4 dBm at 2.5 GHz.<> View full abstract»

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Aims & Scope

This Periodical ceased production in 2000. The current retitled publication is IEEE Microwaves and Wireless Component Letters.

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